"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ78-C8L : 21 January 2020), Harley D Cobb in household of Ray S Cobb, Columbus, Columbus Township, Warren, Pennsylvania, United States; citing enumeration district (ED) 62-5, sheet 6B, line 53, family 125, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3618.
Find a Grave, database and images (https://www.findagrave.com : accessed 05 October 2020), memorial page for Harley Duane Cobb (8 Nov 1930–3 Jun 1943), Find A Grave: Memorial #198194228, citing Westlawn Cemetery, Columbus, Warren County, Pennsylvania, USA ; Maintained by JNicholson (contributor 47800166).
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DNA Connections
It may be possible to confirm family relationships with Harley by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Cliff Cobb :
Y-Chromosome Test 27 markers, haplogroup 12b